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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9beed180afd61c311fd2d6aecc6818ce3d4ede7b8b2c88b9b26dbb402444f1e9' 
  AND token = 'yuVsJrc49tfWB2Dd62WU6qNAYfQcTugjOnzurqB/1jE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}